Envelop.



' B; A. COLE.

ENVELQP. APPLICATION FILED JUNE 8. 1906.

Witnesses PATENTEDJAN. 21, 1908.

2 SHEETS-SHEET 1.

I YE ahwmQ I 4 No. 877,050. PATENTNED JAN; 21, 1908.

B. A; COLE. BNVELOP. APPLICATION FILED JUNE 8,1906.

2 SHEETS-SHEET 2.

rib/ 700749 warren srarss PATENT orFioE.

BENJAMIN A. COLE, or FERGUS FALLsMI NasorA, ASSIGNOR or oNn-ri-ALF TO FRANK H.

GRAY, or FERGUS FALLS, MINNESOTA.

EnvELoP. I

Specification ofLetters Patent. Applicatmirfiled Jane 8.190s. BerialNo. 320.772.

Patented Jan. 21, 1908.

To all whom it may concern. v Be it known that I, BENJAMIN A. OOLEM common form, excepting that I use a mucicitizen of the United States, residing at Fer-\parts to close them, that is not soluble in gus Falls, in the county of Ottertail, State of Minnesota, have invented certainnew and useful Improvements in Envelops; and I do hereby declare the following to be a full,

' clear, and exact description of the invention,

' wherever they occur.

such as will enable others skilled in the art to This invention has relation to that class of 1 envelops that are constructed with a view to making them proof against being, opened without detection.

It is the object of my invention to provide an envelop of the kindimentioned that hall comprise a dual structure, namely, an outside and an inside envelop f the outside envelop being of substantially common form and construction, while the inner envelop is .of different form and sealed with a mucilaginous. substance, substantially insoluble in water, or resisting solubility in water to an extent that aqueous steam can not be successfully employed to soften or loosen the lines of seal ing', so that the envelop can not be opened without the fact that it has been tampered I with becoming apparent.

The nature of t e invention has been so far disclosed in the foregoing statement as to warrant me in proceeding at once with a descri tion of the invention in emtenso, in view of t e annexed drawings, forming a part of this s ecification, and finally pointing out, with istinctness and particularity, the part or improvement constituting the invention in the subjoined claims.

Of the said drawings, Figure 1 isa view of the back side of the envelop, the up er fla of the outside envelop being open and stem?- ing up, and the'like fla of the inside envelop being folded down, bot i in unsealed position. Fig. 2 is a transverse vertical section with the parts in the position in which they are represented in Fig. 1. Fig. .3 is a back view of the inside envelop with the top flap folded up. Fig. 4 is a view of the reverse side of the inside envelop, as it is shown in Fig. 3.

Similar figures of reference designate similar' parts or features, as the case may be,

In carrying out my invention, I may employ as the oustide Wrapper, an envelop 10 of that aqueous steam will not readily soften the ,urn. through a single thickness of paper so t at the'envelop cannot beopened In an envelop so constructed, I secure the wrapper-1 1 consisting of a sheetofpaper a little narrower than the length of the envelop 10 in which it is laced, and I fold the lower flap 12 up and the upper flap 13 down, the latter flap overlapping the former to a slight extent and making the inner wrapper 11 somewhat narrower than the outside envelo .10. With the latter envelop ready for sea ing, I 'um the uper outside margin of the, lower ap 12 Wit a mucilaginous substance not readily soluble in water and then introduce the bottom portion of the inside wrapper 11 into the outside envelop10 with the result of sealing the outer surface of the lower inside flap to the inside surface of the. lower and end flaps of the outside envelop .10. The lower outside margin ofthe upper flap 13 of the inside wrapper is then gummed with the same mucilaginous substance as lower flap, in which condition the envelop is considered asfinished and offered for sale.

In use, the matter to be transmitted by the envelop is placedin the pocket inside of the inside Wrapper, and the upper flap of the same has the gummed surface moistened with or sealed to the upper inside mar in of the lower flap of. the inside wrapper an a portion of theinside surface of the outer envelop above said lower inside flap, and the upper outside flap is sealed down as usual or after applica tioii to the gummed surface of filSOlVGIIt solustances the sealed parts cannolt be separated by aqueous steam or other means, so far known to me, Without detection.

velop is provided that is well adapted for the transmission of small articles through the from being tampered with or purloined.

The invention is adapted to be used in connection with either lar eV 01 small envelops;

and it is obvious that c anges may be made that hereinbefdre mentioned as applied to the- With this construction a reinforced enlaginous substance as a sealing agent for the er or that resists solubility to an extent a solvent solution and it is turned in and pasted I tion, as before stated. Under these circummails, and as the envelop cannot be unsealed without detection it is comparatively safe in the form and arrangement of parts without departing from the nature and spirit of the invention. I

It is to be noted that the difficulties of loosening the sealing of the inside envelop I are added to by the fact that the aqueous steam will have to act through one thickness of paper beside that bearing the sealing I gum-before it can affectthe latter. 1'0

also to be notedthat no sealin gum is applied to the surfaces of the bo y portion of I either wrapper so as to in any way interfere with or impair the quality of the superscription-.receiving surface.

What is claimed as theinvention, is A safety envelop comprising an outside l "and an inside wrapper, the outside wrapper lower flap of the inside wrapper being sealed being of usual form, and the inside wrapper consistingof a sheet of paper having upper and lower flaps, the outside surface of-the It is' to the inner surface of the lower flap of the outside Wrapper; the u I per flap of the inside wrapper being gurnme on the outer surface outside surface of the upper portion of the upper flap of the inside wrapper and like surfaces of the lower and side flaps of the ioutside wrapperi the surfaces of the body portion of each wrapper being free from sealing gum.

In testimony whereof, I afliX niyesignature,

presence of two witnesses.- t,

I BENJAMIN Af' oops.

Witnesses:

G. H. GARD, F. H. GRAY 

